Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8bbdcb1777e5fc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 22:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f3aa8e63f5218d491abdcc49534bff8 SHA-1: 6cf7b9dc899d5c2735cdb20ca6da6a5f3e66abb4 SHA-256: 4e8bbdcb1777e5fc7c64c7f3973c072c27a16dc70e3eb30179e010bab6e3d16c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infoenergie-loire.org/userfiles/file/folezezexunagasupo.pdf In PDF document text
    • https://invest.pl/userfiles/file/70533270042.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc5147611---fajivovigepuval.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d9b6c8c5e3ecb34f5b3f315088a191c3/45592429959.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/83eace35d34b5711eacfd1ae9a71d374/fomubodufisufen.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021063007023285.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ecf70535544edd8cc750aa0904178349/43608284048.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/93776101026.pdfIn PDF document text
    • https://industriameccanica.it/file/93017425938.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772fe3ebfd0---21370850971.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6309b97c31---79367769494.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/21111031177.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/lavonidejajapa.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/9417732066.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/9527325119.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/rawewapuser.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/57256949301.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f308e816ad19aaa32168a2f4b47022eb/38651159807.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0a3bc1598b40d6d50fd1cb2cca480178/xomatolovu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t27rpvpk4noik02fpjdf0nv991/98204679490.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tegetimu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab72b96e2---dojejom.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/61321521540.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/jifuboza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=worksheet+of+chapter+1+maths+class+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 10808 bytes
SHA-256: 7ec73faf22996bf711e4c3ffd1e6a9f5b4d315cb33fefa95c2d957a2ef2b85c5
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 17640 bytes
SHA-256: 9c1dc4e6f46a470040bf344055198e4510a7ecdbdc7e00c433fd91a3b734176b